chapters 1 & 2

Question 1

what happens to energy in reactions?

Answer 1

gets released or absorbed

Question 2

what is activation energy?

Answer 2

energy needed to kickstart a reaction (eg heat for a fire)

Question 3

what are catalysts?

Answer 3

substances that speed up the rate of a chemical reaction by reducing the activation energy

Question 4

what is an enzyme?

Answer 4

proteins that speed up reactions in cells (catalysts)

Question 5

what are substrates?

Answer 5

reactants of enzyme-catalyzed reactions (eg ATP, glucose)

Question 6

how do enzymes work?

Answer 6

1. reactants (substrates) fit into activation site on enzyme. 2. as the enzyme reacts with the substrates, the chemical bonds on the substrates weaken
2. the substrates end up bonding to each other
3. the product (of the bonded substrates) is released and the enzyme is ready to work again